2015-03-31T21:02:38ZManoeuvring and hotelling external costs: enough for alternative energy sources?http://hdl.handle.net/2117/27075
Title: Manoeuvring and hotelling external costs: enough for alternative energy sources?
Authors: Castells Sanabra, Marcel·la; Usabiaga Santamaria, Juan José; Martínez de Osés, Francesc Xavier
Abstract: Local air pollution is the most relevant externality of maritime transport and its effects are more acute in urban areas as a result of manoeuvring, hoteling, and load/unload activities at ports. This paper is intended to assess ships' local air pollution impact in generally densely populated harbor areas, in order to decide whether or not alternative power supply measures are feasible. First, an optimized infrastructure investment model is developed to ease implementation and maximize the efficiency of alternative power supply projects. Once target harbors and traffic (ship types) within a national port network have been chosen, a vessel traffic analysis (ship type, tonnage, manoeuvring and hoteling times) is carried out to quantify and evaluate annual polluting emissions (PM2,5, SO2, NOx and VOC-s) and their externalities. Finally, the assessment model is applied and results of the Spanish port network case study are discussed. The results
obtained are significant and bring the possibility of further controlling the ship's environmental performance at berth.2015-03-26T15:52:13ZSHIPPOL, Towards an automatic green house effect gases tracing and accounting system in harbor areas by using AIS technologyhttp://hdl.handle.net/2117/27000
Title: SHIPPOL, Towards an automatic green house effect gases tracing and accounting system in harbor areas by using AIS technology
Authors: Velásquez Correa, Sergio Iván; Martínez de Osés, Francesc Xavier
Abstract: The paper analyses for an architecture to detect pollutant emmissions from ships by use of AIS.2015-03-24T15:31:19ZThe prevailing weather and traffic conditions in the evaluation of a future ECA in the Mediterranean Sea. A view into the Western Mediterraneanhttp://hdl.handle.net/2117/26999
Title: The prevailing weather and traffic conditions in the evaluation of a future ECA in the Mediterranean Sea. A view into the Western Mediterranean
Authors: Castells Sanabra, Marcel·la; Martinez de osés, Xavier2015-03-24T15:25:29ZNumerical homogenization for composite materials analysis: comparison with other micro mechanical formulationshttp://hdl.handle.net/2117/26668
Title: Numerical homogenization for composite materials analysis: comparison with other micro mechanical formulations
Authors: Otero Gruer, Fermín Enrique; Oller Martínez, Sergio Horacio; Martínez García, Javier; Salomón, Ramón Omar
Abstract: This work presents a two-scale homogenization procedure to analyze three dimension composite structures by FEM. The theory implemented is compared with other micro-structural formulations: micro models and serial parallel mixing theory, in terms of result accuracy and computational cost. The comparison shows that for linear analysis, the homogenization is an excellent alternative to the other formulations. Its computational cost is substantially lower than the one required by the micro-model and it is able to capture several micro-structural phenomena that it is not automatically recorded by the serial parallel methodology. It will also be shown that the extension of the proposed theory to the non-linear range stills represents a challenge. The major limitation is its computational cost because it requires to solve the sub scale at each gauss point and load step. However, the comparison shows that this cost is in terms of CPU time but not in terms of memory. Based on the results obtained, it can be concluded that the homogenization is an excellent alternative for simulation of materials with complex micro structures. The method is also very promising for non linear simulations, when coupled with a threshold criteria to decide whether it is necessary to analyze the RVE or not. (C) 2014 Elsevier Ltd. All rights reserved.2015-03-11T17:58:42ZSHIPPOL, Towards an automatic green house effect gases tracing and accounting system in harbor areas by using AIShttp://hdl.handle.net/2117/25354
Title: SHIPPOL, Towards an automatic green house effect gases tracing and accounting system in harbor areas by using AIS
Authors: Velásquez Correa, Sergio Iván; Martínez de Osés, Francesc Xavier
Abstract: The paper proposes the control of ship air emmissions by the use of AIS transponders.2015-01-13T18:28:33ZComparison of Survival and Safety Requirements in European Union for Recreational Craft Inspections.A Spanish Case Studyhttp://hdl.handle.net/2117/24860
Title: Comparison of Survival and Safety Requirements in European Union for Recreational Craft Inspections.A Spanish Case Study
Authors: Torralbo Gavilán, Jordi; Castells Sanabra, Marcel·la
Abstract: Statistical data shows that a large number of maritime accidents are related to recreational craft.
For instance, in Spain, more than fifty percent of the emergencies are related to pleasure boats at sea.
Recreational craft marketed in the EU must comply with harmonized technical safety and environmental
requirements defined by Directive 94/25/EC, as amended in 2003. On 28 December 2013, the new recreational
craft directive 2013/53/EU was published in the Official Journal of the European Union. EU Member States have
until 18 January 2016 to amend their national legislation and transpose the new directive. The current directive
94/25/EC as amended by directive 2003/44/EC will be repealed on 18 January 2016, after the full application of
the new text. Although this directive, there is not a clear coordination and equivalence among the EU countries
according to the survival and safety equipment compulsory for recreational crafts. The main purpose of this
paper is to analyze and compare the types of survey / inspections to be carried in pleasure craft (noncommercial
use), periodicity and required safety equipment in some member states of the European Union. A
case study of Spain is presented. From the results obtained, we can make clear that in the European Union there
is a lack of coordination in this area and indicate the need to unify a common pattern in inspections and
survival and safety requirements of recreational boats in the EU.2014-11-26T16:23:58ZRoad and maritime transport enviornmental performance : short sea shipping vs road transporthttp://hdl.handle.net/2117/22257
Title: Road and maritime transport enviornmental performance : short sea shipping vs road transport
Authors: Castells Sanabra, Marcel·la; Usabiaga Santamaria, Juan José; Martínez de Osés, Francesc Xavier2014-03-18T14:33:54ZCost assessment simulator for transport between mediterranean spanish ports and the Black Seahttp://hdl.handle.net/2117/22254
Title: Cost assessment simulator for transport between mediterranean spanish ports and the Black Sea
Authors: Castells Sanabra, Marcel·la; Martínez de Osés, Francesc Xavier; Rodríguez Nuevo, M.
Abstract: There is a strong imbalance in EU transport mode shares. In addition, issues like road traffic, noise, accident rates, and especially polluting emissions result not only in external costs to society, but
also in high logistical costs to transport service customers. The present paper proposes an assessment model to evaluate final internal and external costs of transport chains served by trucks and short sea shipping (SSS). An efficient and fast tool is presented to help customers decide on the most convenient mode of transportation for a specific trade link. The trade links in this paper connect 19 Spanish provinces to the main ports in the Black Sea region (Bulgaria, Georgia,
Romania, Russia, Turkey, and Ukraine) through the ports of Barcelona and Valencia.2014-03-18T13:46:35ZCorrelating students performance with social networks use in teachinghttp://hdl.handle.net/2117/21401
Title: Correlating students performance with social networks use in teaching
Authors: Delgado Ortega, Olga
Abstract: This paper concerns the effectiveness of the use of social networks in attitudinal training courses such as “Leadership”. It is aimed at: 1)comparing the participation of students in study discussions when using or not social networks, and correlating students’ performance with the use of social networking in teaching; 2) analysing the impact of using social networks in teambuilding within a group. It draws on data collected during two years teaching the course “Leadership”.
Findings indicate that students who used social media tools participated 11 times more in discussion and obtained better learning outcomes than those who did not.2014-01-29T16:28:11ZAdvances in the development of a FEM model for evaluation of a Surface-Effect Ship (SES) including skirt dynamicshttp://hdl.handle.net/2117/21396
Title: Advances in the development of a FEM model for evaluation of a Surface-Effect Ship (SES) including skirt dynamics
Authors: García Espinosa, Julio; Serván Camas, Borja; Capua, Daniel di; Ubach Fuentes, Pere-Andreu; Oñate Ibáñez de Navarra, Eugenio2014-01-29T15:51:52ZLa sentencia del caso Prestige: reflexiones y juicio críticohttp://hdl.handle.net/2117/21287
Title: La sentencia del caso Prestige: reflexiones y juicio crítico
Authors: Rodrigo de Larrucea, Jaime
Description: Transcurridos unos días de la sentencia del caso Prestige y alejados de la presión mediática inmediata procede abordar de manera sosegada, una breve reflexión sobre el reciente pronunciamiento de la Audiencia de la Coruña y su contextualización en el marco global de uno de los casos más importantes en nuestra historia.2014-01-20T16:07:05ZOn the interpolation of normal vectors for triangle mesheshttp://hdl.handle.net/2117/20589
Title: On the interpolation of normal vectors for triangle meshes
Authors: Ubach Fuentes, Pere-Andreu; Estruch Tena, Carlos; García Espinosa, Julio
Abstract: This paper analyzes the problem arising from the need to assign information about the normal vectors to the surface at the nodes of a mesh of triangles. Meshes of triangles do not have normals uniquely defined at the nodes. A widely used technique to compute the normal direction at any given node is to compute the weighted average of the normals of each surrounding triangle.
The present study proposes new weighting factors to compute the normal directions at the nodes of the mesh of triangles of a general surface. Previous weights found in the literature used the geometric dimensions
of the triangles themselves to design the weighting factors. The new factors are proposed using the triangles’ circumscribed circles dimensions. The new weights provide superior results than the ones obtained by
previous best practices for a wide range of surfaces. An advanced framework based on the approachability of smooth surfaces by quadrics is presented and used. This framework helps to understand the improved performance of the presented factors with respect to other factors found in the literature. A comprehensive numerical comparison analysis is performed, and the
most precise of all factors is clearly identified.2013-11-12T13:29:33ZAccelerated 3D multi-body seakeeping simulations using unstructured finite elementshttp://hdl.handle.net/2117/20391
Title: Accelerated 3D multi-body seakeeping simulations using unstructured finite elements
Authors: Serván Camas, Borja; García Espinosa, Julio
Abstract: Being capable of predicting seakeeping capabilities in the time domain is of great interest for the marine and offshore industries. However, most computer programs used work in the frequency domain, with the subsequent limitation in the accuracy of their model predictions. The main objective of this work is the development of a time domain solver based on the finite element method capable of solving multi-body seakeeping problems on unstructured meshes. In order to achieve this objective, several techniques are combined: the use of an efficient algorithm for the free surface boundary conditions, the use of deflated conjugate gradients, and the use of a graphic processing unit for speeding up the linear solver. The results obtained by the developed model showed good agreement with analytical solutions, experimental data for an actual offshore structure model, as well as numerical solutions obtained by other numerical method. Also, a simulation with sixteen floating bodies was carried out in an affordable CPU time, showing the potential of this approach for multi-body simulation.2013-10-16T16:25:19ZJournal of environmental protectionhttp://hdl.handle.net/2117/20388
Title: Journal of environmental protection
Authors: Usabiaga Santamaria, Juan José; Castells Sanabra, Marcel·la; Martinez de osés, Xavier; Ölcer, Aykut
Abstract: The White Paper published in 2011, Roadmap to a Single European Transport Area [1], urges on a 30% modal shift of road freight over 300 km to other modes (rail, maritime and inland waterways) by 2030, and more than 50% by 2050. However the environmentally friendly performance of maritime transport regarding air pollutant emissions in compari-son with road transport is in doubt. This paper presents a three dimension simulation model, in which performed trans-port work, arisen emissions and produced impact are estimated and inter-related for the assessment of the environmental performance of both road and maritime transport. The simulation model will be a valuable decision making tool for policymakers as it enables the precise assessment of considered transport alternatives in the EU27 until 2020, and hence supports the design of future intervening actions.2013-10-16T15:43:23ZReliability design methodology for confined high pressure inflatable structureshttp://hdl.handle.net/2117/19976
Title: Reliability design methodology for confined high pressure inflatable structures
Authors: Barbero, Ever; Sosa, Eduardo; Martínez García, Javier; Gutierrez, J.M.
Abstract: A design methodology for high pressure, inflatable structures is proposed. The inflatable structure may be partially confined inside large diameter conduits and tunnels. The design addresses the main structural requirements of the system, namely, fabric strength, geometric stability, and axial stability. The proposed
design methodology is based on the concept of limit states. Load and resistance factors are identified for all the stochastic variables participating in the structural design equations. A formal methodology is used to estimate the load and resistance factors from known distributions of data for each of the stochastic variables. The concepts of basis values, coverage, and confidence are used along with the analytical treatment necessary to estimate the load and resistance factors. The analysis is applied to the cases of Normal,
Log-normal, and Weibull distributions of data. Material characterization and data analysis are presented for fabric strength and friction coefficient between the inflatable and the confining conduit material. The system reliability is also evaluated.2013-07-18T12:38:51Z